Machines



3 Sheets-Sheet 1.

(No Model.)

NISTER. SHEET DELIVERY MECEANISM FOR' PRINTING MACHINES. No. 602,23.8.

Patented Apr. 12, 1898.

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E. NISIER. SHEET DELIVERY MEGHANISM FOR PRINTING MACHI'NBS. No. 602,238. I Patented Apr. 12,1898.

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E. NISTER. SHEET DELIVBRY MECHANISM FOR PRINTING MAGHINES.

Patented Apr. 12, 1898.

wwwwwm NITED v STTES' ERNST NISTER, OF NUREMBERG, GERMANY;

SHEET-DELIVERY MECHANISM FOR PRINTING-MACHINES.

SPECIFICATION forming m of Letters Patents No. comes, dated April 12,1898. Application filecl November 16, 1 896. Serial No. 612,182. (Nomodel.)

To all whom it may cancer-n:

Be it known that I, ERNST NISTER, a subject of the King of Bavaria,residing at Nurenberg, in the Kingdom of Bavaria, Germany, have inventednew and useful Inprovements in Sheet-Delivery Apparatus, of which thefollowing is a specification.

My invention has reference to sheet-delivery apparatus forprinting-presses having rotaryimpression-cylinders-such,for instance, aslithographic presses-and has for its object to deliver the sheet withoutits printed side coming into contact with the delivery apparatus whenthe said sheet-delivery apparatus is located at the rear of thecylinder.

'To this end my invention consists, essentially, in a sheet-deliveryapparatus composed of a revolving fly located at the rear of theimpression-cylinder and provided with grippers adapted to take theprinted sheet from the impression-cylihder and to hold the same insuspension and a rocking frame adapted to move upwardly to engage withthe free end of the sheet from beneath while said sheetis Suspended fromthe fly and to receive said sheet with the unprinted side down. Incombination with the elements just recited I make use of a displaceradapted to engage with the printed sheet while Suspended from the flyfor deflecting the same, such displacer being particularly valu able inlarge printin gpresses.

The nature of myinvention will best be understood when described inconnection with the accompanying drawings, in which-` Figures l and 2are side elevations illustrating the operation of the gripper-fly andthe rocking frame. Figs. 3 and 4 are similar views illustrating theoperation of the sheetdisplacer. Fig. 5 is an end view of the same. Fig.6 is a side elevation of a stop-cylinder or lithographic press embodyingmy invention, part being broken away.

Similar letters of reference designate corresponding parts throughoutthe several views of the drawings.

Referring at present to Figs. 1 and 2 of the drawings, the letter adesignates the impression-cylinder, provided With grippers I), servin gto take the sheet fed from the pile of sheets A on the usual feed-board.At the rear of the impression-cylinder a and mounted to turn about anaxis parallel to the aXis of rotation of the same is located a rotaryfly adapted to take the sheets from the impression-cylinder. This fly iscomposed of two arms c' 0 carrying at their ends connecting-rods d ande, Fig. 5,

provided with usual grippers f. The fly is geared to revolve with thesame peripheral velocity as that of the impression-cylinder, but in anopposite direction, as indicated by the arrows in Figs. 1 and 2. Thedisplacer, Figs. 3 and 4, is swung from brackets h, attached to theframe of the machine above the fly and is composed of bent lover-arms g,Suspended from said brackets andconnected with each other by rods i. Therocking frame Ic is mounted to turn about a horizontal shaft located atthe rear of the fly and is provided with delivery-tapcs passing oversuitable rolls Z and m at opposite ends t-hereof. The rolls land mrotate in the same direction as the flyfram'e. The inner end of therocking france is adapted to cross the path of the grippers f of thefly.

The operation of the sheet-delivery apparatus is as follows: The sheetA' is fed from the feed-board to the grippers b of theimpre'ssion-cylinder a and carried over the type or stone. During thetime of printing the sheet the displacer g 'is at rest and the rockingframe 7; is in a horizontal position. After about half a revolution hasbeen made the impression-cylinder is in the position shown in Fig. 1.The grippers b of the same then open and the printed sheet A' isdelivered to the grippers f of the fly. When the sheet has completelyleft the impression-cylinder, owing to the upward movement of the fly,the sheet Vibrates laterally, Fig. 3, such movement being partlyproduced by the weight of the freely-suspended sheet and partly by themovement of the fly, which continues to revolve with a uniform speed.The forward movement of the displacer gt' now takes place and turns thesheet into the position shown in Fig. 4, and the grippers f are thenopened and the sheet is received with its printed side up by the tapesor equivalent surface of the rocking frame k, which in themeantime hasbeen turned upwardly to its extreme position, as shown in Fig. 2. Thesheet 'is delivered by the tapes to the delivery-table. The displacerand the rocking frame then assume their original positions, Figs. 1 and3.

In Fig. 6 I have shown the sheet-delivery apparatus embodied in astop-cylinder or lithographic press and illustrated means for Operatingthe several parts.

The fly carrying the grippers f is operated from opposite sides bygear-wheels m', meshing into the gear-s of the impression-cylinder a.The displacer g 75 is vibrated by means of an arm n, attached to itsshaft and connected with a crank-arm p by a rod 0, said crankarm beingvibrated by a cam s, properly ti med. The delivery-frame k is rocked bymeans of a cam t, engaging with a roller-stnd mounted on one of itssides. The shafts of the cams are rotated from a pnlley or chain wheelw, which is geared to a supplemental shaft a", geared to the main shaftof the machine.

In smaller printing-presses the displacer g 'i may be omitted, becausein such presses the pendulous motion of the sheet is in itselfsufficient to produce the later-al deflection necessary to bring thesheet over the rocking frame 75 when the same is moved npwardly.

The sheet-delivery apparatus may of course be applied to anyprinting-press having an impression-cylinder mounted to rotate.

What I claim as new is- 1. In a sheet-delivery apparatus forprinting-presses, the combination of arevolving fly located at the rearof the impression-cylinder and provided with grippers adapted to takethe printed sheet from the impression-cylinder and to hold the same insuspension under vibration, and means adapted to engage with the freeend of the sheet from below while said sheet is Suspended from the flyso as to receive said sheet with the unprinted side 40 down,substantially as described.

2. In a sheet-delivery apparatns for printing-presses, the combinationof a revolving fly provided with grippers adapted to take the printedsheet from the impression-cylinder, a displacer adapted to engage withthe printed sheet while Suspended from the fly, and a frame providedwith delivery-tapes for receiving the printedsheet, substantially as(lescribed.

3. In a sheet-delivery apparatns for printin g-presses, the combinationof a revolving fly provided with grippers adapted to take the printedsheet from the impression-cylinder, a vibratory displacer adapted toengage with the printed sheet while snspended from the fly to deflectthe sheet, and a rocking frame -adapted to move upwardly to receive thesheet when deflected, and provided with deliverytapes, snbstantially asdescribed.

4. In a sheet-delivery apparatus for printing-presses, the combinationof a revolving fly provided with grippers adapted to take the printedsheet from the impression-oylinder by its leading end and to hold thesame in suspension, and a rocking frame adapted to move npwardly toreceive the following end of the sheet while Suspended from the fly, andprovided with delivery-tapes, snbstantially as described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribin g witnesses.

ERNST NISTER.

Witnesses: CARL ROCSCHELY, OSCAR BOOK.

